Columnar three-dimensional magnetic storage unit and writing method

A columnar three-dimensional magnetic storage unit, comprising,

• a central nanopillar, which is a nanopillar structure made of a material having a spin-orbit coupling effect;
• a magnetic storage layer, which wraps an outer side of the central nanopillar, the magnetic storage layer comprising,
• a magnetic free layer, which surrounds and contacts the central nanopillar, with a polarization direction of the magnetic free layer extending axially along the nanopillar structure, and the magnetization reversal of the magnetic free layer depending on spin-polarized electrons, whose polarization direction is circumferential, generated by the central nanopillar, a damping-like torque and a field-like torque generated by the spin-polarized electrons synergistically achieving the magnetization precessional reversal of the magnetic free layer,
• a magnetic tunneling layer, which wraps an outer side of the magnetic free layer,
• a magnetic pinned layer, which wraps an outer side of the magnetic tunneling layer, with a polarization direction of the magnetic pinned layer extending axially along the nanopillar structure;
• an outer electrode, which wraps an outer side of the magnetic pinned layer;
• a top electrode, which is arranged on an upper side of the central nanopillar;
• and
• a bottom electrode, which is arranged on a lower side of the central nanopillar.